Brightness can range from -1.0 (black) to 1.0 (white). This brightness control is relative to the normal colour when the AGG is created. AGG brightness depends on the brightness of the ITR of each layer. Calling dGetBright_AGG will poll all layers, and if all have the same brightness, this is returned. If any of the layers have a different brightness, the current brightness of each layer is changed to be the reference brightness (0.0)and the brightness value of 0.0 is returned.

Return Value

Type: Double